Unpublishing rep/tech records removes their names from the front end of your FastGem instance. If you wish to unpublish or publish a rep/tech record, log into the admin pages (back end) of your instance, and click 'Reps'.
Use the check boxes beside the names of those reps/techs/users you wish to publish/unpublish to select them, then click 'Publish' or 'Unpublish' at the top of the page accordingly.
Note: reps/techs whose User records have been blocked/disabled will automatically be unpublished, and vice-versa. FastGem support can turn the automatic unpublishing/publishing feature off for your instance if you wish.